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A147271 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,3,9,23,45,169,1061,6743,40273,284761,2852385,36414365,

%T 522818739,8493813357,169218922641

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.0.1.1.1.1

%e .0.0.1.1.0.0.0.1

%e .0.0.0.1.0.0.0.1

%e .0.0.0.1.0.0.0.0

%e .0.0.0.1.1.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)